Matching up an early 915 to 87 trailing arms

[Shaun @ Tru6]

I've got a 75 915 with 4-bolt 2-stud flanges for the inboard CVs, same as outboard mating up to 73 stub axles in steel trailing arms.

I want to put a set of 87 trailing arms in the car. Can I pull the hubs out of my steel arms and insert them into the later ones? What are my options for getting the axles to work?

[Chuck Moreland]

just move the four bolt stubs to the new arms and you are good to go

[Tyson Schmidt]

Actually the bearings in the aluminum arms are a little wider so it won't be ideal. The stub axle won't stick through as far. It will bolt up but you won't get the kotter pin through.

[Tyson Schmidt]

You could swap your inner cv joints onto late axle shafts though.

[Tyson Schmidt]

Wish I was at work to look on PET to see if the part numbers are the same for the stub axles on '73 and older, and '74 on.

[Shaun @ Tru6]

Thank you Chuck, thank you Tyson. Looking at 74 PET and an 86 PET, there is no direct correlation, but close. I think the best thing I can do is pull the 87 axles out and measure the all-in-one stub compares against the separate early one, and of course push one in and see what it does. Still have to dismantle the parts car I got recently for its upgrades. I know on the transmission side there are different splined flanges and I thought trailing arm wasn't completely plug and play as well.

Swapping CVs might work too.

Appreciate the help.

[Tyson Schmidt]

I believe you should be o.k. like Chuck said. I believe the flanges for the steel and aluminum arms are different to compensate for the wider bearing, and the stub axles are the same length.

[Shaun @ Tru6]

Thank you Tyson.